| 单词 | mirror drum |
| 释义 | > as lemmasmirror drum mirror drum n. a scanning device, first used in early television transmitters and receivers, consisting of a rotating drum having its curved surface covered with a number of equally spaced plane mirrors, the number of mirrors determining the number of scanning lines in the picture. ΘΚΠ society > communication > broadcasting > television > transmitting or receiving apparatus > [noun] > scanning devices mirror drum1927 scanning disc1927 scanner1929 Nipkow disc1934 line scan1938 scanning coil1938 1927 Wireless World 20 Apr. 480/2 As the mirror drum revolves, these seven beams trace seven lines at once on the screen, and then pass over another adjacent track of seven lines until the entire screen has been covered. 1935 M. G. Scroggie Television iii. 22 The scanner which has been used for the last few years to transmit the B.B.C. programmes by the Baird low-definition system, and also in a large proportion of the receivers, is the mirror drum. 1991 Proc. SPIE (Internat. Soc. Optical Engin.) 1358 1134 Two different high speed ciné cameras were used for this work, a Hadland ‘Imacon’ 792 electronic image converter camera and a Cordin 377 rotating mirror-drum optical camera. < as lemmas |
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